Glasgow forward Rob Harley has followed Ruaridh Jackson in extending his contract with the Warriors.

The 21-year-old, who has captained the team to three victories in the absence of regular skipper Al Kellock, has signed a two-year extension, tying him to the club until May 2014.

The West of Scotland product made a huge impact in his first season as a professional last term, scoring his first try against Edinburgh at Murrayfield and winning Scotland A caps.

Harley, who was in Scotland's provisional World Cup squad, described his decision to commit himself to the club as "straightforward".

He added: "I've enjoyed my time here immensely and I know it's the right place for me to continue to develop.

"It's been an honour to captain the team while Al was at the World Cup, and I feel like the club is in a good place both on and off the field as we prepare for another massive game against Ospreys."

Head coach Sean Lineen said: "Rob is a real warrior, in all senses of the term. He's a real tough competitor with a fantastic work rate who always wants to learn. He's a pleasure to coach, and it's a real boost to have got him tied up on an extended contract."

Harley retains his place for the visit of Ospreys in the RaboDirect Pro12 on Friday night at Firhill as Lineen welcomes back his World Cup players.

Glasgow have made six changes from the team that beat Dragons three weeks ago with Chris Cusiter, Graeme Morrison, Kellock and Richie Gray all thrown straight back in following their exploits in New Zealand.

Pat MacArthur also comes in to replace Finlay Gillies while Ryan Wilson will start in the number eight role that Johnnie Beattie occupied against Dragons. Dougie Hall and John Barclay will be reintroduced from the bench, while Jackson (hamstring), Moray Low (calf) and DTH Van der Merwe (shoulder) all miss out through injury.